Lantronix X300 Series X300 Series User Guide Rev B - Page 191

Field IP Port Backup Server Enable Socket Timeout Enable 17: Tunnel Description IP address of the external Modbus master on the LAN or WAN interface. Modbus TCP port number that the server is listening on. The default Modbus TCP port number is 502. If client mode is selected, select the box to configure a backup Modbus master. Enter the backup server's IP address and port number. Select to configure socket timeout. Enter the inactivity timeout period in seconds. Tunnel Accept In Accept mode, the gateway listens (waits) for incoming connections from the network. A remote node on the network initiates the connection. The configurable local port is the port that the remote device connects to for this connection. There is no remote port or address. Serial data can still be received while waiting for a network connection, keeping in mind serial data buffer limitations. To configure Accept mode: 1. Go to Tunnel > Tunnel 1, Tunnel SPP Slave, or Tunnel SPP Master. 2. Under Accept, enter the Accept mode configuration settings. 3. Click Save & Apply. Field Mode Local Port Table 17-2 Tunnel Accept Mode Configuration Description Set the method used to start a tunnel in Accept mode.  Disable - do not accept an incoming connection.  Always - accept an incoming connection (default).  Any Character - start waiting for an incoming connection when any character is read on the serial line.  Start Character - start waiting for an incoming connection when the start character for the selected tunnel is read on the serial line. Use the default Start Character B, or enter a custom start character. The Flush Start Character setting flushes the start character when a new connection is made. Set the port number for use as the network local port. The default local port number correlates with the tunnel instance.  Tunnel 1: 10001  Tunnel SPP Slave: 10002  Tunnel SPP Master: 10003 X300 Series IoT Cellular Gateway User Guide 191